UR 44 with external hardware

Hi guys.

Hope someone can help me!

I’m running two mics into channels 1 & 2 on the UR44, then using line outputs 1 & 2 to patch into two external hardware inputs left and right (Roger Mayer stereo 456), then routing back into inputs 5 & 6 in the UR44, then USB to computer. I just get a noise through my headphones and nothing is working. Is it possible to do this? It works fine when I disconnect the external hardware so I haven’t broken anything.

Thanks in advance!